Determines whether the specified column (key) is present in a query.
queryKeyExists(query, key)
→ returns boolean
query.keyExists(key)
Uses the member function syntax
news = queryNew("id,title",
"integer,varchar",
[ {"id":1,"title":"Dewey defeats Truman"}, {"id":2,"title":"Man walks on Moon"} ]);
writeOutput(news.keyExists("title"));Expected Result: true
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